Control device for the fuel-supply pumps of injection-type internalcombustion engines



22, 1930. J. c. GROFF 1,771,037

CONTROL DEVICE FOR THE FUEL SUPPLY PUMPS 0F INJECTION TYPE INTERNAL COMBUSTION ENGINES v Original Filed March 26, 1927 \oe 10s I 55 P 278 2 H6 1 23! n2 Fig 2 INVENTOR Patented July 22, 1930 UNITED SATES JOSEPH C. GEOFF, F ALLENTOWN, PENNSYLVANIA.

CONTROL DEVICE FOR THE FUEL-SUPPLY PUMPS 0F INJECTION-TYPE IN TERNAL- COMBUSTION ENGINES Originalapplication filed March 26, 1927, Serial No. 178,537. Divided and this application filed. March 27,

1928. Serial The present invention relates to improvements in the control devices of fuel-supplying pumps used for internal combustion engines of the fuel injection type.

' The present application constitutes a division of my co-pending application Serial Number 178,537, filed March. 26, 1.927.

Heretofore, difficulty has been experienced in satisfactorily effecting desired adjustments to the control devices which regulate the working performance of this class of pumps. This difficulty has been particularly experienced in connection with fuel pumps intended-for supplying fuel to injecting devices of the so-called automatic airless-injection type.

In this connection, it should be understood that the performance of such pumps is largely dependent upon, and may be desirably 2o altered by changing, the particular working action of, what is commonly termed, the fuelpump by-pass valve. That is tosay:

(a). No fuel is delivered to the power 1 cylinder injecting valve (during simul- 5 taneous discharging action of the fuel supplying pump-plunger) as long as the fuel-pump bypass valve is raised off its seatinto any of its open positions.

(1)). The timing of the instant, at which,

, fuel is initially supplied to the injecting valve (during simultaneous fuel-discharging action of the pump-plunger), may be determined by adjusting the timing of the instant at which the by-pass valve finally closes.

(c). The timing of the instant, at which, supplying of fuel to the injecting valve is terminated (during simultaneous fuel-discharging action of the pump-plunger) may be governed by adjusting the timing of the instant at which the bypass valve initially opens.

(03). The elapsed period, or, duration of such fuel-supplying action to said injecting valve may be desirably varied by varying the time interval elapsing between the respective 45 instants of final closure and of initial opening of the by-pass valve of the fuel pump.

(e). The relative volume of fuel delivered by the fuel-supplying pump to the fuel inj ecting valve, for any given desirable and unno changed rate of such fuel delivery, may be desirably governed to suit rising and/or falling load demands upon the engine by respectively retarding and/or advancing the aforementioned timing of the instant of initial opening of said by-pass valve.

From the foregoing it may be understood, that, in the case of a multiple cylinder engine, where a separate fuel-supplying pump acts to supply fuel to the respective individual cylinders thereof. it becomes highly desirable, if not absolutely essential, to provide the said pumps with individual control-adjusting means for the purpose of equalizing such undesirable discrepancies as might exist among their individual performances from time to time. That is to say, the respective individual fuel pumps should be capable of being desirably adjusted in order that each of the respective cylinders of a multi-cylinder engine may develop its pro-rata share of power and otherwise act in a normal manner.

One of the objects of the present invention resides in the provision of improved controladjusting means for fuel-supplying pumps which will be better adapted to effect desired adjustments to the control devices of any one individual unit of a multiple unit pump while the pumps are in operation and without undesirably aifecting the group adjustment of the remaining pump units.

A further object of the present invention resides in the provision of improved means whereby such individual and independent control-adjustments among the different pump units of a multiple unit pump may be effected by control members which are capable of being manually manipulated from exterior points remotely located with respect to the working portions of the fuelpumping mechanism.

Other and more detailed objects and advantages of the present invention will be hereinafter pointed out in the accompanying specification and claims andshown in the drawings which, by way of illustration, show what I now consider to be preferred embodiments of my invention.

Inthe drawings:

Fig. 1 shows a lateral sectional view of my improved control-adjusting device and is taken substantially on line 1-1 in the direction of the arrows in Fig. 2.

Fig. 2 shows a longitudinal sectional view of the device shown in Fig. 1 and is taken substantially on line 2-2 in Fig. 1 and in the direction of the arrows.

Certain of the parts shown in Fig. 1 have been omitted in Fig. 2 for the sake of clearer illustration and vice versa. Also, certain of the parts shown in Figs. 1 and 2 near the same reference characters as those borne by the similarly acting parts shown in my aforementioned original and co-pending application.

In order to more clearly describe my inven-v tion I will first briefly describe the most desirable known method of controlling the by-pass" valve performance of known forms of fuel-supplying pumps. Thus. in Fig. 1 E is a by-pass valve of any suitable known character interposed between fuel supply passage 22 and the pumping chamber 44 formed within the fuel-pump body member 61. Said valve E (show in Fig. 1 as being seated in its closed position) is adapted to be raised from off its seat into any of its open positions by any suitable means such as tappet 53.

Oscillating means of any suitable known character may be employed to impart reciprocatory movements to tappet member 53 while so oscillating about any suitable.

adjustably-mounted pivot-bearing such as 112. Preferably however. tappet member 53 is adapted to be reciprocated by means of any suitable projection carried by bellcranklike member 48. Said member 48 is also adapted to be oscillated about the pivotbearing 112 by any suitable known driving means such as crank A.

It will be understood that. by driving the crank A off and/or by the engine crankshaft (not shown in the drawings) or from other suitable parts connected thereto, the driven oscillating member 48 will always oscillate in substantially unchanged timed relation with respect to said engine parts.

With the eccentrically mounted pivot bean ing 112 occupying the position shown in 1 said bellcrank 48 oscillates about a point indicated by the intersection of vertical center-line 69 with horizontal sectionline 22. As thus shown, the eccentricity of said eccentrically mounted pivot-bearing 112 is indicated by the intercept on line 22 included between the vertical center-lines 69 and 781. That is to say, as shown in Fig. 1, pivot-bearing 112 is adapted to receive bodily adjusting movement through any desirable portion of a circular arc the center of which is shown as being the point of intersection between lines 781 and 2-2. Such circular adjusting movement of pivot bearing'112 has the efiect of changing the position of 112 through a desired vertical range which is illustratively indicated by clearance 278.

The useful and desired effect, which results from the vertical component 278 of such circular adjusting movement of pivot bearing 112. is to desirably vary the vertical clearance 279 indicated between tappet 53 and the bottom of the stem portion of bypass valve E. It should be understood that such variation in clearance 279, by means of circular bodily movement of pivot bearing 112. has the effect of desirably alter-in the timing of initial-opening and/or of M1- closure of by-pass valve E with respect to the fixed and unchanging timing of the enginedriven actuating crank A.

Having described the working operation of a fuel-pump by-pass valve such as E and the preferred known method of controlling its working action by means of adjustably pivoted oscillating means, I will now describe my novel control-adjusting device for effecting independent adjustments to any of the individual fuel-pumping units of a n'inltiple-cylinder engine.

Referring now to Fig. 2. each of the previously mentioned adjustable eccentricallymounted pivot bearing members 112 is rigidly connected to one end of one of the three nested tubular members 105, 106 and 107. The particular pivot-bearing 112 shown in both Figs. 1 and 2 is shown as being connected to the tubular member 106.

Here it should be noted that the mechanism shown to the right of division line 115 in Fig. 2 indicates a preferred'emhodiment of my novel control-adjusting means for a multiple pumping unit arrangement which consists of three such pumping units. The mechanism shown to the left of said division line 115 will be described hereinafter.

Each of the pivot-bearings 112 preferably has a journallike portion adapted to work in a bearing support such as 108 and 109. Said journallike portions of 112 are concentrically disposed with respect to each and all of the nested tubular members 105, 106 and 107, but are eccentrically disposed with respect to the pivot-bearing 112 itself.

Preferably, one and the innermost (i. 2. having the smallest diameter) of the nested members. such as 231, traverses the entire length of the longest tubular member, shown as being 105 in Fig. 2, and has a lever arm of any suitable character such as 103 attached to the outer of its two ends which extends through to the outside of the pump housing 109. This'lever 103 will hereinafter be referred to as the common manipulative control member for effecting so-called; group adjustments to all of the respective pumping units of a multiple-unit pump arrangement.

Each and all of the respective pivot-bearing members 112 preferablyhavethe outer:

(i. e. with respect to the pump housing 109) ends of their respective tubular extensions 105, 106 and 107 connected to the aforesaid common control member 103 by any suitable known means such as by the radial levers 104. Said levers 104 will hereinafter be referred to as the individual control-adjusting members, and act to independently effect desired compensating adjustments to the various controls of a multiple unit pump. That is to say, any one of the three pivot-bearing members 112 (shown to the'right of line 115) may be given any desired individual circumferential compensating adjustment with respect to, and independently of, the other pivot bearing connected to the common control lever 103 by levers 104;

Where the number of pumping units of a multiple-unit pump exceeds, say, four units, I prefer to employ the arrangement indicated by Fig. 2 in its entirety. Thus for the six unit arrangement shown in Fig. 2 (in its entirety) the three pivot-bearings 112, shown to the left of line 115, are connected to the aforementioned remotely located common control member 103 via the nested intermediate sleeve members 105', 106' and 107', via the lever members 104: and 103, via the intermediate central shaftlike member 231 which would then be unbroken in way of line 115.

I prefer to provide positive means for supplying lubricant to the various operating joints of my eccentric pivot control-adjusting device. Thus, as shown in Fig. 2, lubricant may be supplied to internal passage 120 in center shaft 231 from any suitable outside source of supply via any known form of connection such as 116. The pressure action of the lubricant thus supplied forces it through various ports and grooves as shown, to lubricate the pivot-bearing members 112 via passages 118, and the supporting bearings therefore, namely 108 and 109 via passages 117. Such pressure action of the entrapped lubricant also tends to fill any existing clearance spaces between the nested sleeve members and/or other parts to insure their individual freedom against sticking fast from corrosion. It is important that the various working parts, though especially the pivot-bearings 112 and support bearings 108 and 109, be properly lubricated, since repeated oscillating movement of these parts to effect control-regulating adjustments in the working action of the fuel-supplying pumps woul soon cause undue wear and objectionable clearancevariations.

It should be noted that, with my novel control-adjusting means, whereby independent individual compensating adjustments may be effected remotely from the working parts of the pump mechanism, the said pumping mechanism may be constructed so as to occupy considerably less space than that affnrded by previous control-adjusting means which necessitated that such adjustments be made by the operator working in and around the interior parts of the pump mechanism.

What I claim is:

- 1. A fuel-supplying pump control-adjusting means for regulating the supply of fuel to internal combustion engines of the fuelinjection type comprising a plurality of adjusting means for adjusting the timing of valving action of the by-pass control valve thereof, one for each pumping unit of a multiple-unit pump, a common and remotely located manipulative means for all of said means, and individual adjusting means associated with the remote common manipulative means for relatively and independently adjusting the said individual adjusting means with respect thereto.

2. The invention set forth in claim 1 in which the intermediate connection between the remote common manipulative means and the individual adjusting means comprise nested sleeve devices.

3. The invention set forth in claim- 1 in which the intermediate connection between the remote common manipulative means and the individual adjusting means comprise independently circumferentially adjustable sleevelike' members each' having fixedly mounted thereon an individual eccentrically disposed bearing portion adapted to act as an adjustable pivot support for a leverlike mem ber adapted to oscillate thereabout.

In testimony whereof I hereto aifix my signature.

1 JOSEPH C. GEOFF. 

